<template>
 <div>{{ msg }}</div> 
</template>

<script setup>
import { reactive } from 'vue'
const obj = reactive({
    msg: '不畏浮云遮望眼，只缘身在最高层'
})
setTimeout(() => {
    obj.msg = '欲穷千里目，更上一层楼'
}, 3000);

</script>

<style>

</style>